Means for preparing pulp in paper making



April 16, 1929. F. KERR ET AL u MEANS FOR PREPARING PULP IN PAPER MAKING 2 Sheets-Sheet Filed May 51, 1928 281 TTQRNEY fia Z immermhl,

INVENTORS J ll y .5217" k April 16, 1929, KERR. ELT\AL 35709,].33

MEANS FOR PREPARING PULP IN PAPER MAKING Filed May 31, 1928 2 Sheets-Sheet 2 INVENTORS .FZy igfnflgrzz'zy erwan W ATTORNEY Patented Apr. 16, 1929.

UNITED STATES PATENT OFFICE.

FAY KERR, 0F AJERYVJ ILLE, ILLINOIS, AND MAX ZIMMERMAN, OF LOGKPORT, NEW I YORK.

MEANS FOR PREPARING PULP IN PAPER MAKING.

Application filed May -31,

This invention relates to a novel means for preparing pulp stock for paper or straw board manufacture; and the invention has reference, more particularly, to a novel apparatus for breaking down straw and other stock and disintegrating the same to produce a long fibrous pulp suitable to be worked on paper or straw board.

The invention has for its principal object to provide a novel arrangement and construction of apparatus adapted to shred straw and other paper stock, that has first been softened or cooked in the usual manner, whereby the same is quickl disintegrated or broken into the desired ii rous pulp ready for use on paper making machines. To this end the apparatus consists in a novel arrangement and construction of crushing or shredding mills in combination with a screening drum, by use of which a continuous pulping operation may be rapidly and economically carried out with a minimum of handling and labor.

- Other objects of this invention, not at. this time more particularly enumerated, will be clearly understood from the following detailed description of the same.

The invention is illustrated in the accompanying drawings, in which Figure 1 is in part a side elevation and in -part a sectional view ofthe pulping appa ratus made according to and embodying the principles of this invention; Figure 2 is a transverse section through the screen drum of the apparatus, drawn on an enlarged scale; and Figure 3 is a fragmentary perspective in part section of'said screen drum, drawn on a further enlarged scale.

Similar characters of reference are eniployed in the aforesaid views, to indicate corresponding parts.

Referring now to said drawings, the reference character 5 indicates any suitable form and construction of supporting frame. Mounted in bearings 6 for longitudinal extension alon each side of said frame 5 are parallel sha s 7 adapted to. be driven from any suitable source of power, such e. g. as an electric motor 8, by suitable transmission mechanism .9. Said shafts 7 are provided with drive pinions 10 to operatively engage the external ring gears 11 which are secured to exteriorly offset flanges 12 of a screen drum 13; all whereby said screen drum 13 is rotated about its longitudinal axis. Said screen drum isopen from end to end, and the 1928. Serial No. 282,030.

same is mounted to provide an axial downward slope or inclination from one end to the other. The body of said screen drum is provided with a multiplicity of perforations 14 leading outwardly from its interior, and secured to the interior sides of the walls of the screen drum are longitudinally disposed inwardly projecting flights 15. Arranged beneath said screen drum 13 there may be placed a catch-basin or save-all tank 16 as shown in Figure 1.

Disposed adjacent to the up-tilted receiving end of said screen drum 13 isa primary shredder or disintegrator meansof a special design, the same comprising a cylindrical housing 17 having a feed or receiving hopper 18 at its upper forward side, and in its bottom portion being provided with a series of transverse spaced shredder bars 19 arranged to form intermediate openings 20; said bars 19 being disposed concentric to the axis of the housing 17. Beneath said shredder bars 19 is a discharge chute 21 which leads into the receiving end of said screen drum- 13. .Extending axially through said housing 17 is a driven shaft 22 ada ted to be rotated from any suitable'source of power. Fixed on said shaft 22, so as to'rotate therewith, and disposed within the housing 17, are carrying discs 23 to which are pivotally connected a series of shredding hammers'24 to radially extend beyond the peripheries of the discs 23. Connected with said housing 17, so as to communicate with the interior thereof, is a supply pipe 25, adapted to supply water or other suitable liquid for contact with the stock deliverance into said primary shredder to cleanse and furthersoftenthe same. "A delivery conveyor 26 of any suitable kind is arranged to deliver straw or other stock into the receiving hopper 18 of said primary shredder or disintegrator. t

Disposed adjacent to the down-tilted or discharge end of said screen drum 13 is a secondary shredder or disintegrator of the same general character and construction as, that of the above described primary shredder or disintegrator, as is evidencedby the application of corresponding reference characters thereto in the drawings whereby its I detail structure is indicated as corresponding to that of said primary shredder or disintegrator already above described. The receiving hopper 18 of said secondary shredder or disintegrator is disposed to receive the straw pulp discharged from the screen drum 13, and a discharge chute or conduit 27 is provided to receive the pulp from said secondary shredder or disintegrator and thereupon delivering the same to any suit able place of storage, or tea place for further treatment or use thereof,

In the operation of the apparatus above described, straw or other paper stock, which has first been cooked, softened and chemicaltreati-td in any well known manner familiar to those skilled in the paper making art, is

deliveredby the conveyor 26 into the receiv- 'ing hopper 18 of the primary shredder or disintegrator housing 17. .The shaft 22 of the latter being set in motion, the discs 23 are rotated to cause the pivoted hammers 24 to be carried around and across the shredder bars 19, thereby working the stock between the hammers and bars with a'very rapid lacerating and shredding efiect, so that the stock is rapidly broken down into a fibrous pulpy mass which escapes through the openin'gs 20 intermediate the shredder 'bars' ,19.

To "aid improducing the desired rapid shredding or disintegrating of the stock to provide the desired pulp, water or other desired liquid is delivered with the stock into the housing 17. The reduced stock or pulp dis charged through the openings 20 between the shredder bars 19 is conveyed'by the chute 21 into the receivingend of the longitudinally inclined screen drum 13. The rotation of the screen drum 13 carries the pulpy mass'onwardly through the drum, while at the same time subjecting the same to the tumbling action of the flights 15 which loosens up the mass. While thus tumbled about, the mass is at the same time further cleansed bv-water sprayed thereupon from a-water elivery pipe 28 which extends through the upper portion of the drum screen 13, thereby washing out of the pulp the lime or other chemicals with which the stock had been previouslyfitreated. The cleansing water is drained away through the perforations 14, and thereupon discharged into the save-all tank 16, so that any pulp carried therewith may be reclaimed. The pulp thus worked through the screen drum 13 is discharged from the lower end thereof into the secondary shredder or disintegrator, in which the pulp is subjected to a further shredding and disintegrating to reducc'the same to the degree of fineness desired preparatory to working the same on paper making machines; The pulp dis charged from the secondary shredder or disintegrator'is conveyed through the chute or conduit 27 to a place of storage or for any further treatment or use desired to be made with respect thereto.

It will be obvious that the novel apparatus above described will operate in a continuous manner to rapidly and efliciently reduce paperstock of all kind, and especially tough stock, such as straw, to the desired pulpy consistency. The pivoted hammers of As' many changes could be made in the aboveconstruction and many apparently .widely difierentembodiments ofthis invention could be made without departing from' the scope thereof, itis intended that all matter'contained in the above description or shown in the accompanying drawings shall be interpreted as illustrative and notin a limiting sense.

Having thus described our invention, we.

claim 1. An apparatus for-reducing paper stock to pulp, comprising a primary shredder consisting in a cylindrical housing having spaced shredderbars in its bottom portion and revolving pivoted hammers to coact with said shredder bars, a rotatable perforate screen drum open at its ends into which the pulped I material discharged from said primary shredder is delivered and through which the same is passed, and a secondary shredder similar in character to said primary shredder adapted to receive and further work the pulped material discharged 'from said. screen drum.

2.' Anapparatus for reducing paper stockto pulp, comprising a primary shredder consisting in a cylindrical housing having spaced shredder bars in its bottom portion and revolving pivoted hammers to coact with said shredder bars, and a rotatable perforate screen drum open at its ends into which the pulped material discharged from said primary shredder is delivered and through which the same is passed, and means to supply cleansing water-to the drum interior.

' 3. An apparatus for reducing paper stock to pulp, comprising a primary shredder consisting in a cylindrical housing havlng spaced shredder bars in its bottom portion and revolving pivoted hammers to coact with said shredder bars, means to supply a liquid for mixture with the stock delivered'into said primary shredder, a rotatable perforate screen drum open at its ends into which the pulped material discharged from said primary shredder is delivered and through which the same is passed, and means to sup ply cleansing water to the drum interior,

screen drum open at its ends into which the pulped material discharged from said'primary shredder is delivered and through which the same is passed, means to supply cleansing water to the drum interior, said screen drum serving to drain from the pulp, the major portion of liquid, and means in saidscreen drum to agitate the pulped materialas it progresses therethrough.

5. An apparatus for reducing paper stock to pulp, comprising a primary shredder consistlng in a cylindrical housing having spaced shredder bars in its bottom portion and re volving pivoted hammers to coact with said shredder bars, means to supply a liquid for mixture with the stock delivered" into said primary shredder, a rotatable perforate screen drum open at its ends into which the pulped material discharged-from said'primary shredder is delivered and through which the same is passed, means'to supply cleansing water to the drum interior, means in said screen drum to agitate the pulped material as it progresses therethrough subject to the cleansing action of the supplied water, and a secondary shredder similar in character to said primaryshr'edder adapted to receive and further work the pulped material discharged from said screen drum.

6. An apparatus for reducing paper stock to pulp, comprising a primary shredder con-.

sisting in a cylindrical housing having spaced shredder bars in its bottom portion and re- 'fi volving pivoted hammers to coact with said shredder bars, means to supply cleansing water for application to the stock under treatment, a rotatable perforate screen drum open at its ends into which the pulped materi a1 discharged from said primary shredder is delivered and through which the same is passed to drain therefrom the major portion of its liquid content, and a secondary shredder similar in character to said primary shredder adapted to receive and further work the pulped material discharged from said screen drum 7. An apparatus for reducing paper stock to pulp, comprising aprimary shredder consisting in a cylindrical housing having a receiving hopper leading thereinto, shredder bars in the underside .ofsaid housing, said shredder bars being spaced to provide discharge openings, a discharge chute beneath said discharge openings, a driven shaft extending axially through said housing, discs tions fixed on said shaft, and a plurality of hammers pivotally mounted to the marginal portions of said discs to extend radially therefrom for cooperation with said shredder bars, a rotatable downwardly inclined open ended perforated screen drum with which the discharge chute of said shredder communicates, and means to rotate said drum about its longitudinal axis.

8. An apparatus for reducing paper stock to pulp, comprising a primary shredder consistmg ina cylindrical housing having a receiving hopper leading thereinto, shredder bars in the underside of said housing, said shredder bars being spaced to provide discharge openings, a discharge chute beneath said dischar e openings, a driven shaft extending axia ly through said housing, discs fixed on'said shaft, and a plurality of ham- 'mers-pivotally mounted to the marginal por tionsv of said discs to extend radially therefrom for cooperation with said shredder bars, a rotatable downwardly inclined open ended perforated screen drum with which the discharge chute of said shredder communicates,- meansto rotate said drum about its longitu-- dinal axis, and flights connected with the interior surface of said drum to t-umble'the material moving therethrough.

9. In an apparatus as defined in claim 7 in which means is provided to supply a cleansing and softening liquid for contact with the material traversing said screen drum.

10. An apparatus for reducing paper stock to pulp, comprising a primary shredder consisting in a cylindrical housing having a receiving hopper leading thereinto, shredder bars in the underside of said housing, said shredder bars being spaced to provide discharge openings, a discharge chute beneath said discharge openings, a driven shaft extending axially through said housing, discs Xed on said shaft, and a plurality of hammers pivotally mounted to the marginal. porof said discs to extend radially therefrom for cooperation with said shredder bars, a rotatable downwardly inclined open ended perforated screen drum with which the discharge chute of said shredder communicates, means to rotate said drum about its longitudinal axis, and flights connected with the interior surface of said drum to tumble the material moving therethrough, and a secondary shredder similar in character to said primary shredder located at the discharge end of said screen drum and adapted to receive and further work thematerialdiseharged from the latter. v 7

11. An apparatus for reducing paper stock to pulp, comprising a primary shredder consisting in a cylindrical housing having a re-' said discharge openings, a driven shaft extending axially through said housing, discs fixed on said shaft, and a plurality of hammers pivotally mounted to the marginal portions of said discs to extend radially therefrom for cooperation with said shredder bars, a rotatable downwardly inclined open ended perforated screen drum with which the discharge chute of said shredder communicates, means to rotate said drum about its longitudinal axis, and a secondary shredder similar in character to said primary shredder located at the discharge end of said screen drum and adapted to receive and further Work the material discharged fromthe latter. I

12. In an apparatus as defined in claim 11 in whichmeans is provided to supply a cleansing and softening liquid for contact with the 'material traversing said ,soreen drum.

In testimony, that we claim the invention set forth above we have'hereunto set our hands this 17th day of May 1928.

FAY KERR. MAX ZIMMERMAN. 

